Just when you thought Kim Kardashian's divorce to Kris Humphries couldn't get any messier her estranged hubby has decided to sharpen the claws and is now using the reality star's pregnancy as ammunition.

Kris Humphries is continuing his war on Kimmy (WENN)

According to TMZ, the basketball star's lawyer has filed documents accusing the reality star of using her unborn baby to speed up their divorce proceedings.

The legal document obtained by the celebrity news site states: ''What is really going on here is that an 'urgency' in the form of an apparently unplanned pregnancy, something [Humphries] had nothing to do with, is perceived by [Kim] as an opportunity to gain a litigation advantage by trying to force this court to prematurely set this matter for trial.''

Pregnant Kim Kardashian has been trying her best to move on (David Durocher/WENN)

Kris' lawyer was also keen to highlight his bafflement at the 31-year-old's decision to fall pregnant in the midst of their legal proceedings.

''Indeed, why would [Kim] plan to get pregnant in the midst of divorce proceedings?'' The document reportedly reads.

The former couple's divorce battle has now dragged on for a year, with Kris intent on exposing Kim as a "fraud" who married him on "false pretences for financial gain".

The new document also adds the player is not the father of Kim's baby as the court might assume so as they are still married.